package com.zygk.library.util;

import android.content.Context;
import android.os.Environment;
import java.io.File;
import java.math.BigDecimal;

/**
 * Created by Wikison on 2018/6/12.
 */
public class CacheManager {

  public static String getTotalCacheSize(Context context) throws Exception {

    //Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
    long cacheSize = getFolderSize(context.getCacheDir());
    //Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
      cacheSize += getFolderSize(context.getExternalCacheDir());
    }
    return getFormatSize(cacheSize);
  }

  public static void clearAllCache(Context context) {
    deleteDir(context.getCacheDir());
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
      deleteDir(context.getExternalCacheDir());
      //下面两句清理webview网页缓存.但是每次执行都报false,我用的是魅蓝5.1的系统，后来发现且/data/data/应用package目录下找不到database文///件夹 不知道是不是个别手机的问题，
      context.deleteDatabase("webview.db");
      context.deleteDatabase("webviewCache.db");
    }
  }

  private static boolean deleteDir(File dir) {
    if (dir != null && dir.isDirectory()) {
      String[] children = dir.list();
      for (int i = 0; i < children.length; i++) {
        boolean success = deleteDir(new File(dir, children[i]));
        if (!success) {
          return false;
        }
      }
    }
    return dir.delete();
  }

  // 获取文件
  //Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据
  //Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
  public static long getFolderSize(File file) throws Exception {
    long size = 0;
    try {
      File[] fileList = file.listFiles();
      for (int i = 0; i < fileList.length; i++) {
        // 如果下面还有文件
        if (fileList[i].isDirectory()) {
          size = size + getFolderSize(fileList[i]);
        } else {
          size = size + fileList[i].length();
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    return size;
  }

  /**
   * 格式化单位
   */
  public static String getFormatSize(double size) {
    double kiloByte = size / 1024;
    //if (kiloByte < 1) {
    //  if (kiloByte == 0) return "0K";
    //  return size + "Byte";
    //}

    double megaByte = kiloByte / 1024;
    if (megaByte < 1) {
      BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
      return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "K";
    }

    double gigaByte = megaByte / 1024;
    if (gigaByte < 1) {
      BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
      return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "M";
    }

    double teraBytes = gigaByte / 1024;
    if (teraBytes < 1) {
      BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
      return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "G";
    }
    BigDecimal result4 = new BigDecimal(teraBytes);
    return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "T";
  }
}
